IMAGE TOOLS
Resize Image in Centimeters
Resize a photo to an exact size in cm at any DPI.
Your files are processed on your device and are never uploaded.
Resize a photo to an exact size in centimetres – for example 3.5 × 4.5 cm, 5 × 5 cm or 10 × 15 cm. Forms and print shops often describe sizes in cm rather than pixels; this tool converts them for you using the DPI you choose, so the image prints at precisely that size.
How to Resize an Image in cm
- Choose your image.
- Enter the width and height in cm – the unit is already set to centimetres.
- Set the DPI: 300 DPI is standard for printing and official forms; 200 DPI is common for signatures.
- Optional: keep the aspect ratio, choose JPG, PNG or WebP, and enter a maximum size in KB.
- Click Resize image and download.
How cm Become Pixels
Pixels = centimetres ÷ 2.54 × DPI. So 3.5 cm at 300 DPI is 413 pixels, and 4.5 cm is 531 pixels. The tool does this maths automatically and also stores the DPI in the file, so printers and form checkers read the right size.
Common Sizes in cm
- 3.5 × 4.5 cm – passport and exam photos (see Photo 3.5 × 4.5 cm).
- 6 × 2 cm – signatures (see Resize Signature).
- 10 × 15 cm – standard photo prints.
- 21 × 29.7 cm – A4 (see Resize to A4).
Resize in Millimeters Resize in Inches Resize by Pixel Convert DPI
Frequently Asked Questions
How do I resize an image in centimetres?
Choose your image, type the width and height in cm, pick the DPI (300 for printing) and click Resize image.
How are centimetres converted to pixels?
Pixels = cm ÷ 2.54 × DPI. For example, 5 cm at 300 DPI is 591 pixels.
Which DPI should I choose?
300 DPI for prints and most forms, 200 DPI for signatures if your form says so.
Will the image print at exactly that size?
Yes. The DPI is saved in the file, so printers and form checkers read the correct physical size.
Is Resize Image in Centimeters free to use?
Yes. Resize Image in Centimeters is completely free, with no sign-up, no watermark and no limit on how many times you use it.
Are my files uploaded to a server?
No. Your files are processed directly in your web browser on your own device. Nothing is uploaded or stored, and the file is gone from memory when you close the tab.